Pneumatic pump



H. 5. ROGERS PNEUMATIC PUMP June 21, 1932.

Filed May 17 W1! ENTQR.

Patented June 21, 1932 UNITED? PATENTS? one! HOMER- S. BOGERS;= OF*MILWAUKEE, WISCONSINQASSIGNOR'WO MILWAUKEE AIR:-IPUWER.--L PUMPCOMPANY;QFJHILWAUKEEVISGONSIN; A CORPOBATIONwOE WISCONSIN PNEUMATIC PUMP Application fi1ed"May17, 1926i Serial No. 109,549."

Th 'is invention relates to improvements in" single eylinder pneumatic pumps: of the type r more particular-1y adapted for pumping we Oiie ot the objects 0fthepresentinvention' is to providemn improved pump'of the character referred to wherein the actuating meehanism for the fluid exhaustand inlet is valves-functions to cause simultaneous open- "ing and Elosing of the "same; 'respectively', when= the==water in the pumping r'chamber reaches the l ow level point and irrespective of the" rate "-at* which water may be drawn from the'pumpingchamber at the instant the low level'point is reaehed;- this mechanism providing foi" such-operation ofthese valves in a quicrpositive' manneix- Another object is to provide'an.improved A pu'mp of-tl1e=-characten referred to wherein the actuatingrmeans 1501'. the fluid exhaust valveincludes' a memberacting asafloat-at high= leve'l tocause elosingi of this valveand acting at' low level to "-urgef'th'e valve awayfron1 its 'seat,"-* and wherein means -are ar- -""ftaru, 'edin thepumping chamberresponsive- Y to "low =s-level conditions therein to act upon theexh aust' valve at this time and initiate opening'movement thereof vvhilepermitting continuation and-completion of this move" ""ment by the abovemember-Which atthis time is aho'vethe Water level and-acts as a Weight J Another" object is to provide an improved pump of the character referred=to "wherein the actuating -mechanisl'nfor the fluid inletand exhaust valves-is simple in construction and" operationand is eapa bleof operating eontinuously over -a relatively long-periodof time withc'iut replacement or---readj ustment of any of the parts; a

Other objects "and advantages! will hereai inafter appearw For the "purpose "of illustrating-the inven tion' one emb odirnent' thereof is show-ii in the i drawing, wherein- Figured is a vertical sectional-view of the pump; a-nd' Fig. 2 is a horizontalsect-ional viem taken on-- .t=he=line"-- 2 2 ofFig. 1.

Tli'e pump casing comprises the --cylinder 10, the toot member ll closingthe lower end:

mas shown to open With-"the pressure in the pumping chamber 141'] For-the purposemf" conveying Water from-the pumping Chamber to the Water outlet passage 18;" a pipe -20 "is thre'adedinto the underside ofhead portion" 15 and extends downwardly to Wvith-iii a rel 05- thereof and being provided with the" water intake port 12 Controlle-dby a suitable cl1eck-'- valve:13 arranged to close with the' pressure i in the pumping chamb'e'r 14 andthe-head member 15"cl0sing the upperend-- of'cylind-e'r "10' and being provided- -with the fluid inlet ypassage l6,'the =fiuid Ollfil'GfiOP exhaust pas l sage 17', and the-Water outlet=passage l8 controlledby a suitable check valve' 19arrangedatively short distance from: the bottemof the pumping chamber; 1

i For the purpose of controlling the-fluid outlet or exhaustpassage 17; a suitable-valve 21 is provided and 'arrangedto close-With the pressure in "pumplng chamber 14, as

shown, a suitable'needle' valve22b'eing pro- :vided-to control=the aclni'issionol fluid under pressure from passage l6 toth'e pumping chamber and beln'g arranged A lever -ar1n- 23' is pivotally connectedin :term'edia'te its endsat *24 t0a depending-lug 25 which may be formed-integially- 1with Member 23 "is pivotally-fcons0 1 member 15. nectedat one end thereof to the fluid"-inlet 'tively, as well as simultaneous reverse move member '23 is provided with a transversei the underside of Iever"23"beloiv-the fliiid e2 ,haust valve 21, and'acts' 'at high levelcon ditions in the pumping chamberto close -exhaust valve 21 andopen the fluid inlet valve 22, the arrangement being-[such 'that ValVe" to close against a the pressure-"1n passagejlGl ner when the Water in 'cha'n'l'ber "1 1 reaches the high level point, it is proportioned so as to have an appreciable weight under low level condition in the pumping chamber when it is not subject to the buoyant action of the water. The relation between the area of the fluid exhaust valve 21 and the weight of float 29, however, is such that when the parts are in their respective positions, as shown in Fig. 1, at which time the fluid inlet valve 22 is open and pumping chamber 14 is under the working pressure, the force acting upwardly upon the underside of valve 21 is suflicient to sustain the weight of'float 29 and to hold this valve closed against the weight of member 29 tending to pull the same from its seat. It will thus be apparent that some means-must be provided for initiating or starting the opening movement of the fluid exhaust valve 21 when the water in chamber 14 reaches the low level point, and to this end a lever 30 is pivotally con nected at one end thereof by means of a pin 31 to a lug 32 which may be formed integrally with head member 15, the other end of this lever being pivotally connected at 33 to a vertically arranged rod 34 having a float or buoyant member 35 fixed to the lower end thereof. The portion 38 of lever 30 is bent outwardly around valve 21 and pipe 20, as more clearly shown-in Fig. 2, and a similarly shaped complementary piece 39 is secured at its ends to lever 30 by means'of pin 31 and a rivet or other suitable means 40. As shown in the drawing, lever 30 is arranged upon downward pivotal movement thereof to engage head 28 of member 23, a slight amount of loose play being provided between these parts when the same are in their respective positions as shown in Fig. 1.

Member 35 is sufficiently buoyant to cause upward pivotal movement of lever 30 to the position shown upon filling of the pumping chamber 14 through valve 13, The arrangement and weight of member 35 is such that when the level of the water in chamber 14 drops to a point slightly short of the lower end of the water outlet pipe or passage 20,

the effective weight of member 35 will then be sufficient to cause downward pivotal movement of lever 30 about pin 31 as a center whereby lever 30, upon engagement thereof with head 28 at the outer end of member 23, initiates downward movement of the latter against the pressure in chamber 14 acting to hold the fluid exhaust valve 21 against its sufiicient to continue and complete the opening movement of valve 21 and the closing of inlet valve 22 although the drawing of water from the pumping chamber may be stopped or continued at a very slow rate at this instant. Water will then flow into the pum ing chamber by way of valve 13 and ll chamber 14 until float 29 is lifted to close valve 21 and open valve 22, thus completing the cycle. There is, therefore, no dead center osition of theactuating mechanism for the uid exhaust and inlet valves 21 and 22.

ltmight be found advantageous, under certain conditions, to supplement or augment the action of the low level float 35 in causing opening of the fluid exhaust valve 21 in the manner explained, and to this end a relief valve of any suitable construction, designated generally by reference numeral 36, may

be arranged below the low water line in the pump chamber for engagement by float 35, as shown, to provide an auxiliary water outlet in the pump chamber at substantially the same instant at which this float begins to function to 0 en valve 21. The arran ement is such that the relief valve 36 begins to.

open under the weight of float 35 just before lever 30 engages the head 28 of lever 23, at which time this opening of valve 36 causes an appreciable drop in the water level which otherwise would not occur whereby the I buoyant action of the water on float 35 is correspondingly decreased to make effective .a greater proportion of the weight of float 35 in effecting downward pivotal movement of lever 30 to open valve. 21 against the working pressure in the pump chamber. Relief valve 36 in this manner provides for more rapid actuation of the fluid valves at low level condition in chamber 14, and also permits of a decrease in the size of float 35 for efficient opera. tion of the pump. In the drawing valve 36 is shown as comprising a pin 37 threaded into foot member 11 and provided with an axial passage 38 opening at its lower end and communicating with the interior of chamber 14, a sleeve or valve member 39 having a sliding fit over pin 37 and provided with an opening 40 arranged to register upon downward movement of the sleeve with the upper end of passage 38, and a spring 41 arranged on pin 37 between member 11 andthe lower end of sleeve 39 for urging the latter upwardly to valve-closing position, a pin or stop 42 being provided at the upper end of pin 37 and arranged to engage the ends of a slot 43 in sleeve 39 to. limit downward and upward movements of the latter, pin 42 engaging the lower end of slot 43 when opening 40 is out of registration with the upper end of passage 38 and engaging the upper end of slot 43 when opening 40 is in full registration with the upper end of-passage 38. A head 44 may be threaded into the upper end of sleeve 39 to engage with the adjacent lower end of float 35 upon downward movement of the latter to cause opening of valve 36 against the action of spring 41. Valve 36, of course, may be of any other suitable construction.

From the foregoing it will-be seen that an improved single chamber pump has been provided wherein the actuating mechanism for the fluid inlet and exhaust valves is simple in construction and operation and is capable of continuous operation over a relatively long period of time without the necessity of replacement or readjustment of any of the parts.

Although but one embodiment of the in vention has been shown and described, of course various changes may be made in the size, shape and arrangement of the parts with out departing from the spirit of the invention or the scope of the claims.

The invention claimed is:

1. In a pump of the character described, the combination with a pump chamber and the fluid inlet and exhaust valves thereof, of a lever connecting said valves for simultaneous operation, a float associated with said lever for operating the same at high level to cause closing of the fluid exhaust valve and opening of the fluid inlet valve, a second lever mounted in the pump chamber and arranged for engagement with said firstmentioned lever to impart initial opening movement to the exhaust valve and simultaneous closing movement to the inlet valve while permitting said float to complete said last-mentioned movements of the valves by its own weight, and a second float for causing operative movement of said second lever at low level condition in the pumping chamber.

2. In a pump of the character described, a pumping chamber having water inlet and outlet ports and fluid inlet and exhaust ports, valves for said ports, the fluid exhaust valve being arranged to close with the pressure in said chamber, means connecting the fluid exhaust and inlet valves for causing simultaneous opening and closing movements of the latter respectively and simultaneous reverse movements of the same respectively, a lever arranged in said chamber above said means and pivotally supported at one of its ends, a buoyant member connected to the other end of said lever for causing downward pivotal movement thereof under low level condition in said chamber, and a second float associated with said means for causing said reverse movements of the fluid valves under high level condition in said chamber while permitting the fluid exhaust and inlet valves to remain closed and open respectively by virtue of the pressure in the pumping chamber acting on the fluid exhaust valve, said lever being ar anged for engagement at a point intermediate its ends and upon said downward movement thereof: with said? 1 means foriinitiating said 'first'enamed'imove ments ofthe fluid valves 'against thet'pres s sure in said chamber while permitting. con-1 tinuation" and completioir'of said movements '5 by virtue of subsequent downward movement '6 of said second float under the action zof gravity.

3. Ina pump of thecharacter descr1bed',:

the fluid inlet and exhaust valves-thereof, ofi a lever connectlngsaid valves for simulta neous operation, a float associated wlth said levee-for operating the same'at highlevel to permitting said float'to. complete said. lastf mentionedmovements of the valves byits own weight, a second float for causing operative'movement of said second lever at low means operable at low level condition in said chamber for augmenting the action of said second float.

4. In a pump of the character described, the combination with a. pump chamber and the fluid inlet and exhaust valves thereof, of a lever connecting said valves for simultaneous operation, a float associated with said lever for operating the same at high level to cause closing of the fluid exhaust valve and opening of the fluid inlet valve, a second lever mounted in the pump chamber and arranged for engagement with said first-mentioned lever to impart opening movement to the exhaust valve and simultaneous closing movement to the inlet valve while permitting said float to complete said last-mentioned movement of the valves by its own weight, a relief valve arranged below the low water line in said chamber and providing an auxiliary water outlet therefor, said relief valve being operable to open said outlet at substantially the same instant at which said second float begins to perform its said function, and a means for closing said relief valve and for holding the latter closed during discharge of water from said chamber.

5. In a pump of the character described, the combination with a pump chamber and the fluid exhaust valve thereof, the latter being arranged to close with the pressure in the pumping chamber, of a member associated with said valve and adapted to act as a float under high level condition in said chamber to cause closing of said valve and as a weight under low level condition in said chamber tending to urge said valve from its seat, means responsive to low level condition in said chamber for initiating movement thercombination with' a pumpirchamberand? level condition in the pumping chamber, and' of said valve away from its seat while permitting continuation and completion of said movement by virtue of the Weight action of said member, means operable by said means for providing an auxiliarywater outlet for said chamber When the Water level in the latter is substantially at its lowermost point, and means for returning said last-named means to and for holding the same in closed position during discharge or" Water from said chamber.

6. In a single cylinder pneumatic pump, the combination with a pump chamber and the interconnected air exhaust and inlet valves and the float for actuating the latter in one direction, of a second float, mechanical means connected thereto and operated thereby for initially actuating said valves in the re verse direction, and a relief valve operable by said second float at low level condition in the pump chamber for providing an auxiliary Water outlet therefor, said float permitting said relief valve to close during filling of said chamber.

In Witness whereof, I hereto affix my signature.

HOMER S. ROGERS. 

